Regular Expressions 101

Explanation

Pro

^start of line

\d{6}a digit, repeated exactly 6 times

Non-Capturing Group(?:\d{2})?

?repeats the group contents below at most once:

\d{2}a digit, repeated exactly 2 times

Non-Capturing Group(?:md?|dm?)?

?repeats the group contents below at most once:

1st Alternativemd?

mthe literal m (109₁₀ / 155₈ / 6D₁₆) (case sensitive)

d?optionally matches the literal d (100₁₀ / 144₈ / 64₁₆) (case sensitive)

2nd Alternativedm?

dthe literal d (100₁₀ / 144₈ / 64₁₆) (case sensitive)

m?optionally matches the literal m (109₁₀ / 155₈ / 6D₁₆) (case sensitive)

$end of line

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

26 tokens

^\d{6}(?:\d{2})?(?:md?|dm?)?$

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